How to setup your wireless interface to auto connect to ap in Ubuntu?

How to setup your wireless interface to auto connect to ap in Ubuntu?
You can set the config in /etc/network/interface like below:

wlan0 auto
iface wlan0 inet dhcp
wireless-essid your_essid
wireless-key your_essid_passphrase
wireless-channel your_essid_channel

Wish this helps.
regards,
Stanley Huang

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